Q: Is a movable pully fixed at all points?

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It is a line segment.

true

A sphere

A line in 2D and a plane in 3D A perpendicular bisector of the line connecting the 2 given points

It is the locus of all points such that their distance from a fixed line (the directrix) is the same as their distance from a fixed point which is not on that line (the focus).

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Yes an elevator is a movable pulley!

a fixed pulley is a pulley that stays at one place to pick up an object. A clothes hanger is a fixed pulley.....this is all i know good luck...

It is a line segment.

The center of the circle. That's how the circle is defined. (The collection of all points on a plane equidistant from a fixed point. The fixed point is the center and the fixed distance is the radius.)

This set of points forms a circle with the fixed point as its center.

triangle

an ellipse.

That's false

A set of all points is how various shapes are made in geometry. Lines are sets of points, and so are surfaces. Circles are sets of all points that are a fixed distance from a central point. All geometric shapes are made from sets of all points.

True

true

A 'spherical' surface.